With gas pricing fluctuations I am considering putting Hydrogen generators on my 3055 Bayliner to supplement the fuel. I have twin 5.7 Merc's in the boat with 2 barrels. for longer cruising range. Has anyone done or considered this?

The automotive industry has put enough sensors on, to make this difficult to say the least. The ECM (Engine Control Module) reads the signals from multiple Oxygen sensors, Mass Airflow Sensor, and other sensors to adjust the fuel mixture. That being said, you would need to address those to see extended range or better more efficient consumption. Even the new diesel Electronic Fuel Injection, has the same issue, "Too much O2 in the exhaust, we need more fuel!!!!" The corrosive nature of the,"Browns Gas," is hard on the valve stems. Almost forgot,"B.O.A.T." Bust out another thousand!

Hydrogen is just a "carrier" not really a fuel.
Let me explain that, it's like a fully charged battery, a battery is a "carrier", you put energy in, and you get a little less out than you put in.
You get Hydrogen from electrolysis of water, using a lot of electricity and considerable amount of time, I'd assume you'd have to have a rather large expensive compressor and some very high pressure tanks to contain it, compared to that, modifying the engine to run off it would be child's play.
Hydrogen was the motor fuel of the future in the 70's, then somebody did the math on how much energy would be required to produce hydrogen.
The reason why gasoline is so popular as a motor fuel is simple, nothing else can give you the amount of power for less money than gasoline can.

a64pilot. You are correct that you get the hydrogen produced through electrolysis. The only thing is you take it from the device directly to the intake and the vacuum of the intake pulls the hydrogen through to the cylinders. I have seen it used on gasoline engines with success. The brown gas mentioned by lonesoldier is a similar application I am considering. This application only works when you are cruising and not foe slow stop and go. Boats cruise usually at a steady 3000-3200 rpm so this is the way I intend to use it. I could post a link to the supplier but not sure that is allowed in the form?

Newhall Yes that is the application I am thinking of. Percentage increases does vary but increase is increase. The person that I know that did it put on a Ford 1 ton and Ford station wagon with a 460 and was very please. He had the skills to make it but I would by a complete system for a supplier. He only used it when he was on the highway.

The hydrogen generators that are supposed to supplement a regular gasoline engine are pure bunk, put them with intake Vordaos, fuel line magnets and 100 MPG carburetors. All hype from the 70's
Reason is, with the size and power consumption that is possible on a vehicle, you just can't get enough hydrogen to make a difference, plus there is a net loss, that is you use 100W of electricity to make Hydrogen, and get maybe 80W of power back.
The energy required to make that hydrogen, comes from your gas tank, even if you could make enough to matter, and you can't it isn't efficient.
Hydrogen is about the cleanest combustion there is, if it could even make 5% difference, manufacturers like Toyota would be all over it, and they aren't.

I've used a home made hydrogen generator in every motor I have owned except tractors. Not much extra room on a tractor. When I commercial fished, I made them for myself and others. On Detroit 671s, I could get a 20%+ mileage increase. I run them all the time, as soon as the alternator is up to speed. You use excess dc amps produced by your alternator and electrolysis. The resulting oxygen and hydrogen is directed into the intake, but not stored. It operates at normal air pressure. You don't need to store it. Then you're not storing a flammable gas (like the people that have to cook with propane).
You control the amps by the mix of water and additives. Once you know the mix, you can premix and make a replenishment system. As you make hydrogen (a burnable fuel) and pure oxygen (that enhances combustion) your mix is slowly used.
My Jeep Cherokee went from 19 mpg to 24+ mpg. This boat went from 10 gallons/hr @ 10 knots to 8+ gallons/hr @ 10 knots. On 12 volt systems. 24 or 48 volt is better (smaller wires/same watts). My old commercial boat made almost 30% better mpg with some other changes.

Okay, let's begin with this: Any website that has, right at the top, in big, bold letters...
Run Your Car On Tap Water Free!

That's a scam. Nothing more. Nothing less. Scam and nothing but scam. You cannot run your car on tap water, and here's why...

Quote:

Originally Posted by Lepke

You use excess dc amps produced by your alternator and electrolysis.

This is the logical fallacy that confuses people. They think that their alternator produces "excess amps" when it is running. It does not. The more energy that you pull from it, the harder it has to work to produce that energy. It does not just spin "for free" and produce excess electricity. When you draw energy from it, that energy has to come from somewhere, and where it comes from is you burning fuel.

I really don't wish to offend anyone, but the plain fact is that if you believe you are getting better gas mileage by using one of these devices, you are only fooling yourself. It is physically impossible for a device like this to increase your gas mileage. You are burning gas, to produce electricity, to convert water, to collect hydrogen, to burn the hydrogen. In the process you are losing a little bit of energy at each step. You would be money and gas mileage ahead to just burn the gas to move your car, truck, boat, whatever.

This is basic, high school physics. But don't believe me. Go to your kids high school and ask the physics teacher about this. They will tell you exactly the same thing that I have just told you.

We all want some miracle cure to improve our gas mileage. I understand that. But this is a scam. Please do not fall for it.

Jack, you get the hydrogen from a Mr. Fusion 305-H, the "H" series will provide excess free hydrogen. You get the best results when you feed Mr. Fusion with freshly trimmed grass cuttings rather than kitchen waste.